I still do loads of airbrushed nail art and even have clients (who for whatever reason don't want 'proper' nail enhancements) send their full cover stick ons to me to airbrush designs on them.
I still have plenty of people coming to me to teach them how to airbrush.
I think part of the problem is the expensive equipment, or people buying the wrong equipment and finding out that it's usless. Another is that people buy the equipment and don't bother getting proper training - find out they can't just teach themselves then give up.
It also depends on what your clients want and what you're able to offer them - if all you show them is way out and weird multi colour abstract designs then it's no wonder none of them want it.
I love airbushing because I'm useless at freehand, and In my opinion, if you're offerring freehand nail art you'd better be good at it as I've seen a lot that looks like a child has done it and none of my clients would pay for that! With an airbrush I can paint the most delicate little flowers, or a lovely subtle colour blend both of which are very popular with a lot of my clients. The designs don't have to be the same on each finger, they don't even have to be on every finger, a lot of the time I'm asked to airbrush a tiny design on just the ring finger.
I get to 'go to town' on holidays such as St Patrick's Day, Halloween, Christmas etc - that's when I find people want something more daring.
My airbrush and equipment has definately paid for itself over the years, but I do think you need to be commited to make it work, proper equipment, proper training and knowing what your clients want. I don't use nail enamel any more as it takes SO long to dry - even those of my clients who just want a single colour on their nails I now airbrush it on, no waiting for base coat, 2 coats of enamel and then a top coat to get touch dry - just thin base coat, spray the colour and then a top coat - I don't get them knocking on my door 2 minutes after they've left asking me to fix the smudge they've just done while opening the car door! And those clients have told me they'd never go back to using nail enamel now so it's more business for me as they don't 'top up' their nail colour at home with the latest No. 7 colour - they come back to me! None of mine were ever interested in buying nail enamel from me when I retailed it so I never lost out there either.
I love airbrushing and most of my clients do too!
Jackie
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